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Improved localization algorithm for distributed fiber-optic sensor based on merged Michelson-Sagnac interferometer.

Qiuheng Song, Pengwei Zhou, Hekuo Peng

    Optics Express
    |April 1, 2020
    PubMed
    Summary
    This summary is machine-generated.

    A new fiber-optic sensing algorithm uses a merged Michelson-Sagnac interferometer for precise, high-sensitivity distributed localization. This method accurately pinpoints disturbances along 120 km of fiber, improving resolution and error margins.

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    Area of Science:

    • Optoelectronics
    • Fiber-optic sensing technology
    • Interferometry

    Background:

    • Distributed fiber-optic sensing enables real-time monitoring over long distances.
    • Existing localization algorithms face challenges in sensitivity and precision.

    Purpose of the Study:

    • To propose and demonstrate a novel distributed fiber-optic localization algorithm.
    • To enhance sensitivity and precision in disturbance detection using a merged interferometer.

    Main Methods:

    • Development of a merged Michelson-Sagnac interferometer.
    • Signal processing involving addition/subtraction of phase differences.
    • Cross-correlation algorithm for time delay calculation.
    • Polynomial fitting interpolation for improved resolution.

    Main Results:

    • Successful demonstration of the proposed fiber-optic localization algorithm.
    • Achieved a total sensing distance of 120 km.
    • Localization errors within ±35 m (contact) and ±160 m (non-contact).

    Conclusions:

    • The merged Michelson-Sagnac interferometer offers high sensitivity and precision for distributed localization.
    • The algorithm significantly improves disturbance location resolution.
    • The system is suitable for long-range monitoring applications.